Typical September weather
Seattle
Washington · September
72° days
54° nights
about 4 rainy days · 12½ hours of daylight
What to pack
- Light jacket
What September feels like
Ask a Seattle local for their favorite month and September comes up more often than July. Bumbershoot fills the Seattle Center over Labor Day weekend, and the first genuine autumn rain usually holds off until the last week or so.
Expect about 4 days with real rain — enough to notice, not enough to plan around. Humidity stays comfortable; the air never feels heavy.
The numbers
| Typical high | 72° |
|---|---|
| Typical low | 54° |
| Days with real rain | 4 |
| Total rain | 1.6 in |
| Humidity | comfortable |
| Sunrise / sunset (mid-month) | 6:47 am / 7:21 pm |